## Why
Code-mode responses show host duration without exposing time spent outside the host, including app-server waiting.
## What changed
- Add `features.code_mode.experimental_show_cell_overhead`, disabled by default, to show handler duration, host duration, and their difference in `exec` and `wait` response headers.
- Reuse the completed handler measurement from tool-call logging, excluding dispatch waiting, and capture it even when logging is disabled.
- Preserve the existing timing format when the option is disabled or host timing is unavailable, and preserve boolean feature toggles when merging nested code-mode configuration.
## Testing
Add coverage for timing headers, zero and missing host measurements, negative rounding differences, content preservation, and configuration merging. Extend app-server tests across gRPC and stdio to verify timing includes post-host elicitation waiting, and add a response snapshot for successful execution and a failed wait.
GitOrigin-RevId: 929b84784d9c6077cf2b5927a90bd2d5f3870078
## Why
Read-only MCP discovery and invocation need a consistent policy across requests, connection reuse, and tool catalogs. Reusing an unrestricted connection or cached catalog can bypass filtered discovery.
## What changed
- Thread `requires_read_only_mcp_tools` through MCP configuration and client setup, leaving it disabled by default.
- When enabled, set `openai/readOnly` to `true` in `tools/list` and `tools/call` request metadata, overriding a caller-supplied `false` while preserving other metadata, pagination, and arguments.
- Include the policy in connection identity and bypass shared Apps and persistent tool catalog caches for read-only connections.
## Testing
Add coverage for metadata propagation in legacy and modern protocol modes, preservation through session recovery, and isolation from unrestricted connections and shared Apps catalogs.
GitOrigin-RevId: f4a3a4021a54e302bffd53f08092b080c056246b
## What changed
- Use the same text rendering for model instructions in request settings and Responses Lite developer content.
- Make `rewrite_known_segments` emit plain tags for recognized guidance, including collaboration and multi-agent instructions. Check message roles and complete tag boundaries so lookalike user or tool content stays visible, and retain generated compaction summaries.
- Normalize working-directory, workspace-root, and temporary paths in permission guidance while preserving policy differences.
- Separate text clipping from normalization and retain eight lines at each end of long sections, with fingerprints for omitted content. Update affected snapshots.
## Testing
Add regression coverage for instruction rendering across transports, literal and rewritten guidance, malformed and lookalike tags, compaction summary preservation, and permission path normalization that keeps policy changes detectable.
GitOrigin-RevId: 33b052911323c73b0387d650478f9cc3370fd001
## What changed
- Add a multi-turn scenario covering `request_user_input_async`, continued work while awaiting an answer, and delivery of the answer into the active turn.
- Add a scenario covering plugin configuration reload in an existing thread, including discovery and use of newly installed skills and MCP tools across turns.
- Render explicit tool output names and namespaces in context snapshots, with a regression test ensuring outputs do not inherit metadata from their calls.
GitOrigin-RevId: 64fca8cb51a3a697fa84bf444ce55b8408961ab5
## What changed
- Use one renderer for captured requests, raw request bodies, and input items. Show only appended items when inputs extend the previous request and settings match; start a new snapshot window otherwise and explain the boundary.
- Add optional request settings and tool inventory deltas. Normalize volatile values with stable labels, preserve multiline content, and fingerprint omitted content so changes remain visible.
- Migrate existing context snapshots and expand compaction snapshots to include request history.
## Testing
Add focused tests for window boundaries, cache key changes, tool deltas, shared item rendering, stable normalization, and fingerprints. Assert that the follow-up request after pre-turn compaction includes the working directory override.
GitOrigin-RevId: 6445b014081208ea432b1f3e2ac835c5e4955cb0
cassirer-openai